Lens-examining instrument.



L. W. BUGBEE.

LENS BXAMINING INSTRUMENT.

APPLICATION FILED FEB.2,1912.

1,098,880, Patented June 2, 1914.

FIG. 11

W/ TNESSES: INVENTOI? y LUCIA/V w. BUGBEE W/flW M SWMWWM COLUMBIA PLANOGRAPH 20.,\vmnmn'ruNv D. c.

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LUCIAN W. BUG'IBEE, OF SOUTHBRIDGE, MASSAGITIUSETTS, ASSIGNOR 1'0 AMERICAN OPTICAL COMPANY, OF MASSACHUSETTS.

SOUTHBRIDGE,

IvIAStlACHUSElEtS, A 'IJORPORA'IION F LENS-EIEHUVHNING INSTRUMENT.

Specification of Letters Patent.

Patented June 2, 1914.

Application filed February 2, 1912. $eria1 No. 674,8?1.

To all whom it only concern:

is it known that l, LUG'LAN W. Become, a citizen of the United States, residing u at t-ioutlibrnlge, in the county of ll orcester and titatc of lr'lassachusetts, have invented certain new and. useful lmpl'rovements in lacns-lllxamining Instruments, of which the following a specification.

My invention relates to improvements n lens examining instruments and has for its object the provision of an improved instrument which may be employed merely for exan'iining lenses in a shaded position to secure direct rays of light therethrough unhampcred by other reliected. side lights.

The further object of my invention is the provision in a machine of this character of improved mechanism which shall enable the device to be used with either iiatural or artificial light as occasion may demand.

Other objects and advantages of my improved lens examining instrument will be readily apparent by reference to the following description taken in. connection with the accompanying drawings, and it Wlll be understood that I may make any modifications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure 1 represents a vertical sectional view of my complete machine. l ig. ll represents a similar sectional view showing a lens in position and illustrating the use of the natural illumination, and Fig. HI repre sents a fragmentary sectional. View on the line Ill-Ill of Fig I.

In the drawings the numeral 1 designates the hollow base of my device which is closed on the under side by the plate 2 having depending therefrom the rests 3 for holding the face slightly above the table or other surface on which my instrument is placed. Secured upon the base 1 and sloping upward therefrom, preferably an angle of about forty-five degrees, tie sighting tube t which may be of any desired shape in cross section, although 1 preferably employ a tube of square shape in cross section, said tube being open at its lower end and being closed at its upper end by the eye piece 5 preferably fitted with the lens 6. Formed inthe top of the base and coincidin with the lower open end. of the tube a is an orifice 7.

When it is desired to use artificial illumination with my instrument or to enable said artificial illumination to be employed when evasion may require, 1 mount within the base 1. the socket S for the light bulb 9 which is disposed directly below the orilice 7, wires 10 leading from the socket to the aperture 11 formed in the base through which connections may be made to any suitable source of electrical supply. To enable me to cut oil the artificial illumination and employ natural light in place thereof I employ the sliding shutter 12 which has the handles 13 rislug therefrom, said shutter being slidable in the recess l l formed in the lower edge of the brace 15 for the sighting tube and being capable of being slid across the orifice 7 to completely close the same. Said slide bears on its upper face the mirror or reflecting surface 16 which, when the shutter is in position to close the orifice T, at an angle of forty-five degrees with the tube.

Formed in the tube near the lower end thereof is a window aperture 1'? closed by the glass 18 which may be either plain, colored or frosted according to the light it is desired to admit through the window into the tube. This window is so disposed that light entering theretlnrough will strike the reflecting surface 16 and be thrown upward through the tube as is clearly shown in Fig. I.

in the use of my improved instrument a lens is inserted into the tube through the entance opening 19 therefor, a shield plate 526 below the aperture preventing dropping of the lens into the tube. Instead of being a shield plate alone, however, this member 20 may be in the form of a lens or series of lenses or like device for changing the quantity or quality of light passing upward through the tube, while if desired the eye piece lens 6 may be a series of lenses or other well known optical contrivanoes instead of the single member shown, this not being an essential part of my invention and, therefore, being no fuller shown or described. In any event it will be seen that the electric light shining direct through the tube or reflected light striking the surface 16 and then passing upward through the tube will. serve to thoroughly illuminate the lens and permit of a satisfactory examination thereof.

I claim:

1. A lens examining instrument including a hollow base and a sighting tube in communication with the base, said tube being formed to permit of the introduction of a lens thereinto, a source of illumination Within the base, a light aperture in the tube, and a slide having a reflecting surface, said slide being adapted to close the connection be tween the tube and base and to reflect through the tube light entering at the light aperture.

2 A lens examining instrument comprising a hollow base and a sighting tube in communication with the base, said sighting tube being at an angle of 45 degrees with the base and having an aperture therein for the introduction of a lens, a source of illumination within the base, a light aperture in the sighting tube near the base and a slide having a reflecting surface, said slide being adapted to close the opening between the base and the tube and to reflect through the tube the light entering the light aperture, and an eye piece placed on the upper end of said tube having a lens therein.

In testimony whereof I affiX my signature in presence of two witnesses.

LUCIAN WV. BUGBEE. Witnesses Anion M. Home, Josnrii J. DEMERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

